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Unformatted text preview: homework 01 – ALIBHAI, ZAHID 1 Latest unpenalized work: Jan 26 2007 Friday 04:00 (after this date you can not make a perfect score). Work cutoff: Jan 26 2007, 4:00 am. Question 1 part 1 of 1 10 points A piece of pipe has an outer radius, an inner radius, and length as shown in the figure below. 3 7 c m 4 . 6 cm 2 . 7 cm b The density is 7 . 6 g / cm 3 . What is the mass of this pipe? Answer in units of kg. Question 2 part 1 of 1 10 points One cubic meter (1.0 m 3 ) of aluminum has a mass of 2700 kg, and a cubic meter of iron has a mass of 7860 kg. Find the radius of a solid aluminum sphere that has the same mass as a solid iron sphere of radius 2 . 68 cm. Answer in units of cm. Question 3 part 1 of 1 10 points A cylinder, 16 cm long and 8 cm in radius, is made of two different metals bonded end- to-end to make a single bar. The densities are 4 . 6 g / cm 3 and 6 . 1 g / cm 3 . 1 6 c m 8 cm What length of the lighter metal is needed if the total mass is 17741 g? Answer in units of cm. Question 4 part 1 of 1 10 points Convert 46 . 2 ◦ to radians. Answer in units of rad. Question 5 part 1 of 1 10 points Use the fact that the speed of light in a vacuum is about 3 . 00 × 10 8 m/s to determine how many kilometers a pulse from a laser beam travels in exactly five hours. Answer in units of km....
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